Open AccessNew Infrared Emission Features and Spectral Variations in NGC 7023
Author(s) -
M. W. Werner,
K. I. Uchida,
K. Sellgren,
M. Marengo,
Karl D. Gordon,
P. Morris,
J. R. Houck,
J. A. Stansberry
Publication year - 2004
Publication title -
the astrophysical journal supplement series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.546
H-Index - 277
eISSN - 1538-4365
pISSN - 0067-0049
DOI - 10.1086/422413
Subject(s) - physics , spitzer space telescope , astrophysics , reflection nebula , infrared , spectrograph , photometer , nebula , astronomy , telescope , stars , spectral line
We have observed the reflection nebula NGC 7023, with the Short-High moduleand long-slit Short-Low and Long-Low modules of the Infrared Spectrograph onthe Spitzer Space Telescope. We also present Infrared Array Camera andMultiband Imaging Photometer for Spitzer images of NGC 7023 at 3.6, 4.5, 8.0,and 24 microns. We observe the aromatic emission features (AEFs) at 6.2, 7.7,8.6, 11.3, and 12.7 microns, plus a wealth of weaker features. We find newunidentified interstellar emission features at 6.7, 10.1, 15.8, 17.4, and 19.0microns. Possible identifications include aromatic hydrocarbons ornanoparticles of unknown mineralogy. We see variations in relative featurestrengths, central wavelengths, and feature widths, in the AEFs and weakeremission features, depending on both distance from the star and nebularposition (southeast vs. northwest).Comment: to be published in ApJS, v. 154, Spitzer Special Issue. 11 pages AASTeX (no figures) plus 1 b/w figure (ps) and 4 color figures (ps
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